Improvement in photographic baths



, B. NEWELL.

Photographic Baths.

N0.15,2,246. Patentedlune23,1874.

I no ,B n C v ,11 C4 D NITD STATES PATENT OFFICE.

ROBERT N EVELL, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT yIN lPHOTOGRAPHIC BATHS.`

Specification forming part of Leiters Patent No. 152,246, dated June 23,1874 application filed December 9,1873.

s To LZ/Z @oh/0m it may concer/a:

Be it known that l, ROBERT N nwELL, of the city and county ofPhiladelphia, and State of Pennsylvania, have invented a new and usefulImprovement in Photographic Baths and I do hereby declare the followingto be a clear and exact description of the nature thereof, sufticient toenable others skilled in the art to which my invention appertains tofully understand, make, and use the saine, reference being had to theaccompanying dra-wings, making part of this specification, in whichFigure l is a front view of the device embodying my invention. Fig. 2 isa side view thereof, a portion having been removed. Fig. 3 is a top viewthereof, the cover of the box being removed. Fig. 4 is a view of adetached part.

Similar letters of reference indicate corresponding parts in the severalfigures.

This invention relates to a photographic bath wherein negatives are tobe coated preparatory to application to the camera. The inventionconsists in the construction of the bath box or holder to preventleakage. It also consists in means for securely holding the cover on thebox or holder. It further consists in rubber blocks interposed betweenthe cover and the eccentric roller which forces the cover against thebox or holder, for preventing straiu on the parts during the greatleverage of the roller.

Referring' to the drawings, A represents a box, which is preferablyconstructed deep and narrow, and ot' wood. rlhe sides B and end pieces Cof the box are firmly secured to each other, and vertically grooved, asat c a, at such points that each groove of the sides will communicatewith one of the grooves of the end pieces, and the grooves break thejoints transversely between the sides and end pieces. The grooves thusconstructed form vertical channels, which will be filled with cement orother suitable material, so that the bath, solution, 0r preparationplaced in the box will be prevented from passing out of the joints ofthe box, the saine being resisted by the transverse channel, as stated,the location of the latter being such that the entire space of theinterior ofthe box is preserved. The inner face of the box will becoated with an acidproof composition in order to protect the wood, and alining of glass or other suitable material may be placed on the coatingto prevent scratching or cutting' thereof by the negative placed in thebox. The bottom D of the box will be attached to the body thereof byrabbeted joints to prevent escape of the bath solution or preparationthrough the bottom. From each side of the box A there rises an ear, E,which is formed with an open slot, F, of .somewhat L shape. G representsa roller, having gudgeons orjournals I-I, which are arrangedeccentrically on the sides or ends of the roller. The roller is adaptedto be placed between the ears E E, and the gudgeons or journals are toenter the slot in said ears. The

box A is provided with a cover, J, which fits thereon between the ea-rsE E, and the roller G is elevated above the cover J to leave a space, K,between the cover and roller. Blocks L of rubber are secured to the topof the cover J, and, when the roller is in position, rest in the spaceK. M represents a pawl, which is hinged to one side of the cover J andadapted to engage with the teeth of a ratchet, N, seA cured to the faceof the roller G. A packing, P, will be interposed between the cover Jand body of the box, and a handle, R, secured to the roller G, forpurposes to be stated.

The operation is as follows: 'lhe box A constitutes a holder or bath forthe preparation with which'the negative is to be coated. The cover J isplaced in position on the top of the box. The roller G is now located oncover J, and its gudgeons are inserted into the slotsF of the cars E tothe upper termination or limbs of said slots, the blocks L keeping thegudgeons in such position, and said upper terminations of the slotsconstituting the subsequent fulcruni of the roller G. Now rotate theroller, by means of the handle It, in the direction opposite to the pawlM, and, owing to the eccentric axis of the roller, the latter will bepressed against the blocks L, and force the cover J tightly against thebox. The pawl M will then drop on the ratchet N, or may be broughtagainst it by hand, and engages with one of the teeth of the ratchet.This movement locks the roller, and completes the operation of holdingthe cover in place. It will now be seen that the box is eoinpletel)vclosed on all sides, and is prooiagainst air, light, and escape of thebath solution or preparation. Access to the box for removing` the coatednegative is had by turning the roller so as to clear the pawl from theratchet and permit the disengagement of said pawl and ratchet, afterwhich the roller lets up the cover, which, with the roller, ean then beeasily reinoved, and the interior ofthe box is exposed. Owing to thegreat leverage of the roller, the rubber blocks L between the roller andcover of the box, while serving to eonnnnnicate niotion 'from the rollerto the cover, yield sut'tieientlv to prevent dead strain on the variousparts and protect them from fracture and breakage.

Having thus described 111)' invention, what I claim as new, and desireto secure by Letters Patent, iisl. The combination. with the sides andend pieces B G ot the bath-box A, ot' the grooves a (l, arranged inrelation to the joints ot' said sides and end pieces and operatingasherein set forth.

2. The eccentric roller Gr and ears'E, in conibination with the bath-boxA and cover J, substantiall)v as and for the purpose set it'orth.

The ratchet N and pawl M, in combination with the` roller G, cover J,ears E, and bath-box A, substantiall)Y as and for the pun pose setforth.

4. rlhe combination, with the eccentric roller G, cover J, ears E, andbath-bo.\ A, of the rubber blocks L, interposed between the roller andcover, substantiallbV as and for the purpose set t'orth.

liOI'l. EEWELL.

Witnesses:

DAVID lnrrLnu, Hnxnr NnwnLL.

